<template>
    <view class="u-wrap">
        <u-navbar :is-back="false" title-color="#ffffff" title="分类" :background="background"></u-navbar>

        <view class="u-menu-wrap">
            <scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
                <view v-for="(item,index) in productTypes" :key="index" class="u-tab-item" :class="[current==index ? 'u-tab-item-active' : '']"
                      :data-current="index" @tap.stop="swichMenu(index)">
                    <text class="u-line-1">{{item.bigTypeName}}</text>
                </view>
            </scroll-view>
            <block v-for="(item,index) in productTypes" :key="index">
                <scroll-view scroll-y class="right-box" v-if="current==index">
                    <view class="page-view">
                        <view class="class-item">
                            <view class="item-title">
                                <text>{{item.bigTypeName}}</text>
                            </view>
                            <view class="item-container">
                                <view class="thumb-box" v-for="(item1, index1) in productItems" :key="index1">
                                    <image class="item-menu-image" :src="item1.propagandaImgPath[0].url" mode="" @click="goProduct(item1.id)"></image>
                                    <view class="item-menu-name">{{item1.categoryName}}</view>
                                </view>
                            </view>
                        </view>
                    </view>
                </scroll-view>
            </block>
        </view>

        <i-tabbar></i-tabbar>
    </view>
</template>

<script>
    import classifyData from "@/common/classify.data.js";
    import tabbar from  'pages/shops/tabbar/index'
    export default {
        components:{
            'i-tabbar':tabbar
        },
        data() {
            return {
                tabbar: classifyData,
				productTypes:[],
				productItems:[],
                scrollTop: 0, //tab标题的滚动条位置
                current: 0, // 预设当前项的值
                menuHeight: 0, // 左边菜单的高度
                menuItemHeight: 0, // 左边菜单item的高度
                background: {
                    //backgroundColor: '#19be6b',
                    // 导航栏背景图
                    //background: 'url(https://cdn.uviewui.com/uview/swiper/1.jpg) no-repeat',
                    // 还可以设置背景图size属性
                    // backgroundSize: 'cover',

                    // 渐变色
                    backgroundImage: 'linear-gradient(45deg, rgb(28, 187, 180), rgb(141, 198, 63))'
                }
            }
        },
		onLoad() {
			this.selectTsProductBigTypeForList()
		},
        computed: {
			
        },
        methods: {
			//获取大类
			selectTsProductBigTypeForList:function(){
				this.$u.api.selectTsProductBigTypeForList().then(res=>{
					this.productTypes = res;
					this.selectTsProductCategoryByCompanyNo();
					console.log(this.productTypes);
				})
			},
			//根据编码获取明细科目
			selectTsProductCategoryByCompanyNo(){
				let productType = this.productTypes[this.current];
				this.$u.api.selectTsProductCategoryByCompanyNo({'productBigId':productType.id}).then(res=>{
					this.productItems = res;
					console.log(this.productItems)
				})
			},
			
            goProduct:function (id) {
                uni.navigateTo({url: "/pages/shops/product/index?categoryId="+id});
            },

            getImg() {
                return Math.floor(Math.random() * 35);
            },
            // 点击左边的栏目切换
            async swichMenu(index) {
                if(index == this.current) return ;
                this.current = index;
				this.selectTsProductCategoryByCompanyNo();
                // 如果为0，意味着尚未初始化
                if(this.menuHeight == 0 || this.menuItemHeight == 0) {
                    await this.getElRect('menu-scroll-view', 'menuHeight');
                    await this.getElRect('u-tab-item', 'menuItemHeight');
                }
                // 将菜单菜单活动item垂直居中
                this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
            },
            // 获取一个目标元素的高度
            getElRect(elClass, dataVal) {
                new Promise((resolve, reject) => {
                    const query = uni.createSelectorQuery().in(this);
                    query.select('.' + elClass).fields({size: true},res => {
                        // 如果节点尚未生成，res值为null，循环调用执行
                        if(!res) {
                            setTimeout(() => {
                                this.getElRect(elClass);
                            }, 10);
                            return ;
                        }
                        this[dataVal] = res.height;
                    }).exec();
                })
            }
        }
    }
</script>

<style lang="scss" scoped>
    .u-wrap {
        height: calc(100vh);
        /* #ifdef H5 */
        height: calc(100vh - var(--window-top));
        /* #endif */
        display: flex;
        flex-direction: column;
    }

    .u-search-box {
        padding: 18rpx 30rpx;
    }

    .u-menu-wrap {
        flex: 1;
        display: flex;
        overflow: hidden;
    }

    .u-search-inner {
        background-color: rgb(234, 234, 234);
        border-radius: 100rpx;
        display: flex;
        align-items: center;
        padding: 10rpx 16rpx;
    }

    .u-search-text {
        font-size: 26rpx;
        color: $u-tips-color;
        margin-left: 10rpx;
    }

    .u-tab-view {
        width: 200rpx;
        height: 100%;
    }

    .u-tab-item {
        height: 110rpx;
        background: #f6f6f6;
        box-sizing: border-box;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 26rpx;
        color: #444;
        font-weight: 400;
        line-height: 1;
    }

    .u-tab-item-active {
        position: relative;
        color: #000;
        font-size: 30rpx;
        font-weight: 600;
        background: #fff;
    }

    .u-tab-item-active::before {
        content: "";
        position: absolute;
        border-left: 4px solid $u-type-primary;
        height: 32rpx;
        left: 0;
        top: 39rpx;
    }

    .u-tab-view {
        height: 100%;
    }

    .right-box {
        background-color: rgb(250, 250, 250);
    }

    .page-view {
        padding: 16rpx;
    }

    .class-item {
        margin-bottom: 30rpx;
        background-color: #fff;
        padding: 16rpx;
        border-radius: 8rpx;
    }

    .item-title {
        font-size: 26rpx;
        color: $u-main-color;
        font-weight: bold;
    }

    .item-menu-name {
        font-weight: normal;
        font-size: 24rpx;
        color: $u-main-color;
    }

    .item-container {
        width: auto;
        height: 100%;
        display: flex;
        flex-wrap: wrap;
    }

    .thumb-box {
        width: 33.333333%;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        margin-top: 20rpx;
    }

    .item-menu-image {
		border-radius: 90%;
        width: 140rpx;
        height: 140rpx;
    }
</style>
